Capacitors and production thereof

ABSTRACT

Capacitors, each having a high-molecular dielectric layer electrode-positioned on at least one of two opposite electrodes thereof and having various excellent properties such as heatresistivity, moisture-resistivity, high breakdown voltage, and high insulating resistivity, are adaptable to mass-production, miniaturization, and large capacitances. The high-molecular dielectric layer is manufactured by the method of passing a direct current on a current obtained by superposition of a direct current and an alternating current or a rectified current between a cathode and the electrode to be deposited thereon with said dielectric layer, said electrode being used as an anode, in an electrodepositing bath consisting of a resin emulsion or resin water solution containing as its main ingredient an anionic polyhigh-molecular electrolytes or in an electrode positioning bath consisting of said emulsion or water solution in which a dielectric material consisting of powdery fine crystal particles or corpuscles is mixed, thereby to deposit a high-molecular dielectric layer on said anodic electrode, and subjecting said electrodeposited layer, successively, to after-treatments such as washing, drying, and polishing treatments.

United States Patent [72] Inventor Akira Matsushita 1088-312, Kitakase,Kawasaki-sin, Kanagawa-ken, Japan [21] AppLNo. 800,506 [22] FiledFeb.19, 1969 [45] Patented May25, 1971 [32] Priority Feb. 19, 1968, Feb.19, 1968 [33] Japan [31] 43/ 10241 and 43/ 12483 [54] CAPACITORS ANDPRODUCTION THEREOF 11 Claims, 11 Drawing Figs. [52] U.S.Cl 29/2542,204/56 [51] Int.Cl ..H01g13/00 [50] FieldofSearch 29/2542;

204/56; 1 17/201, (inquired) [56] References Cited UNITED STATES PATENTS2,281,602 5/1942 Ruben 317/258 3,290,761 12/1966 Ho 29/25.42X 3,348,28410/1967 Galletetal. 29/2542 3,350,760 11/1967 Kilby 29/2542 3,457,6147/1969 Tibal... 29/2542 3,469,294 9/1969 Hayashietal. 29/2542 1,925,3079/1933 DeBoer 204/5674 2,928,776 3/1960 Puppo1o..... 204/56X 3,484,34412/1969 Spiller 204/56X 3,496,424 2/1970 Behrend Primary Examiner-JohnF. Campbell Assistant ExaminerR. B. Lazarus Attorneys-Robert E. Burnsand Emmanuel J. Lobato ABSTRACT: Capacitors, each having ahigh-molecular dielectric layer electrode-positioned on at least one oftwo opposite electrodes thereof and having various excellent propertiessuch as heat-resistivity, moisture-resistivity, high breakdown voltage,and high insulating resistivity, are adaptable to mass-production,miniaturization, and large capacitances. The high-molecular dielectriclayer is manufactured by the method of passing a direct current on acurrent obtained by superposition of a direct current and an alternatingcurrent or a rectified current between a cathode and the electrode to bedeposited thereon with said dielectric layer, said electrode being usedas an anode, in an electrodepositing bath consisting of a resin emulsionor resin water solution containing as its main ingredient an anionicpoly-high-molecular electrolytes or in an electrode positioning bathconsisting of said emulsion or water solution in which a dielectricmaterial consisting of powdery fine crystal particles or corpuscles ismixed, thereby to deposit a high-molecular dielectric layer on saidanodic electrode, and subjecting said electrodeposited layer,successively, to after-treatments such as washing, drying, and polishingtreatments.

PATENIEUmzsmn $579,769

sum 1 or 2 FIG.| FIG.| (B) PATENIED M25197! SHEET 2 or 2 CAPACITORS ANDPRODUCTION THEREOF BACKGROUND OF THE INVENTION The present inventionrelates to capacitors applicable for various electric devices andelectronic devices and to a method for the production thereof.

I-Ieretofore, various kinds of capacitors having various constructionshave been proposed, but their constructional principle resides generallyin that a gaseous, liquid or solid dielectric sheet or film is insertedbetween opposite electrodes of a pair. Furthermore, for the purpose ofmanufacturing a miniature capacitor having a high capacitance, it hasbeen proposed to insert a resinous high-molecular sheet or film betweentwo opposite electrodes or to bond to or apply on said sheet or film onthe surface of at least one of said opposite electrodes. However, in thecapacitors in which a high-molecular sheet having a width wider thansurface area of the electrode is inserted between the oppositeelectrodes, irregular contact with the electrode surface is liable tooccur because of undesirable warp and or nonuniform uneveness of saidsheets thereby to cause howling, tracking irregularity, and staticnoise.

Furthermore, rotary-type capacitors having generally such disadvantagesas the necessity for using a dielectric sheet having a relatively largethickness in anticipation of possible damage caused by abrasion of saidsheet, or in the capacitors in which the high-molecular sheet is merelybonded adhesively to the electrode surface, unification of the kind andthickness of the adhesive is difficult. n the other hand, in capacitorsin which the high-molecular sheet is formed by painting or spraying highmolecular material on the electrode surface, nonuniforrnity of thicknessof the sheet and production of pin-holes caused by volatilization of thesolvent cannot be avoided.

Furthermore, since no appropriate film or sheet having extremely highdielectric constant has heretofore been developed, it has been proposed,with the object of improving the apparent dielectricity of thehigh-molecular film or sheet, to blend ceramic powder having highdielectric constant, for example, powder of titanium oxide or titanatewith the general high-molecular material for preparing the film orsheet. In this case, however, improvement of dielectricity in practiceis relatively lower than the theoretical value because the influence dueto air gap becomes increasingly pronounced with increase in the blendedamount of the material having a high dielectric constant. Furthermore,the film or sheet prepared by the above-mentioned mixture is relativelybrittle, so that it is difficult to wind up the film or to form a verythin and wide sheet.

SUMMARY OF THE INVENTION It is therefore the primary object of thepresent invention to provide capacitors of various types which areadaptable to mass-production, miniaturization, and large capacitancesand have various excellent properties such as heat-resistivity,moisture-resistivity, high dielectric strength, high insulatingresistivity, and high breakdown voltage.

It is another object of the present invention to provide a method formanufacturing capacitors having excellent properties as described inabove-mentioned primary object.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing objects and otherobjects as well as the characteristic features of the invention willbecome more readily understandable from the following description andthe appended claims when read in conjunction with the accom' panyingdrawings, in which the same or equivalent members are designated by thesame reference numerals, and in which:

FIG. I (A) is a plan view of a capacitor according to the presentinvention;

FIG. 1 (B) is a side view of the capacitor illustrated in FIG.

FIG. 2 is a perspective view, partly in section, of a rotary electrodeof the capacitor illustrated in FIGS. I (A) and (B);

FIG. 3 is a plan view of stationary electrodes of a capacitor accordingto the inventions, said view showing a mannerof electrodepositing adielectric layer on each of said stationary electrodes in a continuousor simultaneous process;

- FIG. 4 is an electric circuit diagram of an apparatus adapted to carryout electrodeposition in the manufacturing of the capacitor illustratedin FIGS. 1 (A) and (B);

FIG. 5 (A) is a plan view of another capacitor according to presentinvention;

FIG. 5 (B) is a side view of the capacitor illustrated in FIG. 5

FIG. 6 is a perspective view, partly in section, of a woundtypecapacitor according to the present invention;

FIGS. 7 and 8 are developed views showing terminals of othermodifications of the capacitor illustrated in FIG. 6; and

FIG. 9 is an electric circuit diagram of another apparatus adapted tocarry out electrodepositions in the manufacture of the capacitorillustrated in FIG. 6.

Referring to F IGS, l to 4, the variable capacitor of rotary electrodetype shown therein comprises a casing 2 having a baseplate 6, stationaryposts or pins 3 erectly fixed to the baseplate, a plurality ofstationary electrodes 1 supported by pins 3 or a support frame (notshown), a rotary shaft 5 supported by the baseplate and the casing in aconventional manner, and a plurality of rotary electrodes 4 supported byrotary shaft 5,-the electrodes 1 being opposite to the electrodes 4, andplural pairs of the two kinds of the electrodes being superposed,whereby a variable capacitor is formed. Each of the rotary electrodes 4is provided at its surface with a uniform layer 7 made of ahigh-molecular dielectric material, this layer being electrodeposited onthe surface prior to combination of various parts of the capacitor. Inthe capacitor illustrated in FIGS. 1 to 3, the layer 7 is formed on thesurface of each of the rotary electrodes, but layer 7 may be formed onthe surface of each of the stationary electrodes, or both kinds of theelectrodes may be provided on their surfaces with the layer 7.

Electrodeposition of the layer 7 can be attained by the fol-- lowingmethod. That is, an anionic electrodepositing bath'consisting of a resinemulsion or resin water solution containing a high-molecular materialsuch as water-soluble melamine series, stylene series or watensolublealkyd series, or a water solution consisting of said anionicelectrodepositing bath and a strong dielectric material such as titaniumoxide, barium titanate or boundary electrolyte in an electrolytic cell 9as shown in FIG. 4. The electrode on which the high-molecular dielectriclayer is to be deposited, for example, the electrode 1 to 4 is, afterhaving been previously subjected to a pretreatment such as edgetreatment, surface polishing treatment such as electrolytic polishingand chemical polishing or rough surface treatment, put as ananode 10 inthe above-mentioned electrolytic cell 9 and a direct current I issupplied between said anode l0 and a cathode I1 provided in said cellfrom a direct current power source 12, whereby a high-moleculardielectric layer is electrodeposited on the surface of the anode 10.This layer is then subjected to washing treatment, heat treatment orother solidifying treatment and, if necessary, to surface polishingtreatment, whereby a uniform high-molecular dielectric layer 7 isobtained.

In the formation of the dielectric layer 7, if an alternating powersource 13 (or any pulse source, rectified current source not shown) isprovided besides the power source 12 so as to pass a currentcorresponding to superposition of a direct current and a variablecurrent and said superposed current is utilized to electrodeposition ofthe layer 7, said electrodeposition can be effectively carried out. Inthe apparatus of FIG. 4, the numerals I4 and I5 designate, respectively,a choke coil and a capacitor for checking the direct current component.

A method of carrying out electrodeposition of the layer 7 on a pluralityof the electrodes 1 in a continuous or simultaneous manner will bedescribed in connection with FIG. 3. In this case, a plurality of theelectrodes which are mutually connected at their lug portions is punchedout from a metal sheet and then subjected to the electrodeposition asdescribed in connection with the apparatus of FIG. 4. After thiselectrodeposition, the electrodes are cut off from one another and thenassembled to construct a capacitor.

In the case of constructing capacitors as illustrated in FIGS. 1 to 3,if any particular portions of the electrode surface or lug portions ofthe electrode, said lug portions being adapted to be connected to andfixed on the support pin 3, are previously subjected to insulationtreatment, and then said electrode is subjected to the above-mentionedelectrodeposition treatment, the desirable dielectric layer can beeasily and correctly formed on only the exposed metal portion exceptsaid particularly insulated portions.

As described above, the electrodepositing method according to theinvention is very effective for forming the dielectric layer of anycapacitor which is of relatively small type and requires a dielectriclayer having uniform thickness. However, if the electrode is subjectedto a heat treatment just after it is taken out of the electrolytic cell,resin-flowing or resin-shifting towards edge and end portions will occurowing to contraction of the resinous substance even when anelectrodeposited layer of uniform thickness is uniformly deposited onsaid edge and end portions and side surfaces of the electrode. Thisadvantage increases with increase of thickness of the electrodepositedlayer. This disadvantage can be removed by holding the electrode, justafter it has been subjected to electrodepositing treatment andsucceeding washing treatment or further having been subjected to heattreatment of a short time adapted to maintain the resinous substance inits sintered state, between mirrorlike smooth heating plates, andsubjecting said held electrode to press-drying. This press-drying can becarried out in vacuum chamber or in a specified low pressure gas or saidpress-drying can be attained by continuously passing the electrodethrough heated rolls.

Another modification of the embodiment of the invention illustrated inFIG. 3 will be described below. Referring to FIG. 3, all parts of thesurface of a metal sheet la are, prior to its punching-out, previouslyand primarily subjected to electrodepositing treatment and succeedingheat treatment as described already, thereby to deposit a dielectriclayer of a desired thickness on said metal sheet. From this metal sheettreated as described above, individual electrodes 1 or plural electrodesconnected by their lug portions 30 and connecting pieces 3a are punchedout. In this case, the border edge portions can be removed together withthe frame portions as shown by hatching 112. Then, the above-mentionedpunchedout electrodes are subjected to secondary electrodepositingtreatment as in the case of primary treatment, whereby circumferentialside surfaces 16 and incompletely electrodeposited portions of theelectrodes are electrodeposited with the dielectric layer.

Effects due to flowing and contraction of the resinous material at theside surfaces 16, said flowing and contraction occurring in thesecondary treatment, has no direct relation to the flat surfaces of theelectrodes 1, so that according to the above-mentioned two-steptreatment, a dielectric layer having uniform thickness throughout wholeportions of the electrodes can be easily obtained.

Removal of thickness nonuniformity or transformation of theelectrodeposited layer, said nonuniformity or transforma tion beingproduced at edge portions and curved portions owing to flowing orcontraction of the resinous material in the course of the heattreatment, may be effectively attained within a very short time byirradiation of said portions by an electron beam.

Since the electrodepositing method adopted in the present invention hasan excellent characteristic in its so-called throwing power capable ofcarrying out uniform electrodeposition throughout narrow slits or gaps,it is possible to previously assemble the stationary electrodes androtary electrodes in superimposed positions as a capacitor and then tocarry out the electrodepositing treatment in one step, thus greatlyfacilitating mass-production of the capacitors.

As a whole, according to the electrodeposition method of the invention,there is an essential advantage whereby desirable electrodeposition canbe effectuated at complicated portions such as the circumferentialperiphery I6 of the electrode to be treated or cut slots or slitsprovided on said the electrode.

The embodiment of the invention illustrated in FIG. 5 relates to atrimmer capacitor comprising stationary electrodes I8 aflixed to anupper cover 17 of a casing 2 and rotary electrodes 20 supported by arotary shaft 19 so as to be opposite to said stationary electrodes. Inthis example, the rotary electrodes 20 are provided, at their surfacesopposite to the stationary electrodes 18 and their side edge surfaces,with high molecular dielectric layers 21 which are electrodepositedthereon in the same manner as that described in connection with theexample of FIG. 1. In this example of FIG. 5, aspring force may beapplied from the upper side by means of the rotary electrodes or theirfittings.

The embodiment of the invention shown in FIG. 6 relates to a wound-typecapacitor. This capacitor comprises mutually opposite electrode sheets Aand B, and fibrous or organic resinous sheet inserted between saidsheets A, B with the object of improving electrical and thermalproperties, said sheets being wound together to form the capacitor.

The inserted sheet consists of a craft-paper sheet 34 adjacent to theelectrode sheet A and mica sheets 35 inserted between said sheet 34 andthe electrode sheet B. This inserted sheet may be omitted in some cases.

According to the present invention, at least one of the electrode sheetsA and B is provided, at its surface, with a highmolecular dielectriclayer electrodeposited thereon, said layer consisting of the samematerial and being deposited by the same method as those described inconnection with the example of FIG. I.

In the example of FIG. 6, an electrode connector 33 having an electrodeterminal 33a is attached to the electrode sheet A by means of merecontacting or welding. The electrode connector 33 is preferablyprovided, at its rear and side surfaces, with high-molecular dielectriclayers electrodeposited thereon. The electrode terminal 33a is connectedto a lead terminal 31 attached to a cover 30 of the casing 29. A hole 32provided on the casing 29 is utilized for vacuum treatment of the sealedcasing or for pouring a filling agent into said casing.

FIG. 7 shows developed electrodes of another modification of theembodiment of FIG. 6. In the embodiment of FIG. 7, both surfaces of atleast one of the electrode sheets A and B, or the same side surfaces ofthe electrode sheets A and B are provided with dielectric layerselectrodeposited thereon.

In the embodiment of FIG. 8, the electrode sheet B is made smaller thanthe other electrode sheet A. In this embodiment, there is the risk of ashort-circuit occurring between the lead terminal 33a of the electrodeconnector 33 of the electrode sheet B and the electrode sheet A. For thepurpose of preventing such short-circuiting, an insulating piece 36 maybe placed between the lead terminal 33a and the electrode sheet A orinsulation treatment may be previously applied on the rear side of thelead terminal 33a.

The electrode sheet provided with a high-molecular dielectric layerelectrodeposited thereon can be easily manufactured according to theapparatus and method as will be described hereinbelow in connection withFIG. 9. In FIG. 9, guide rolls 23 and 23a are provided at positions inand outside of an electrolytic cell 9 containing an electrolyte 8 whichis the same as that used in the apparatus illustrated in FIG. 4. Anelectrode sheet 27 wound around a bobbin 22 is passed through theelectrolyte by way of the guide roll 23 and then wound around anotherbobbin 26 provided at the position outside the electrolytic cell 9. Anelectrode 11 is used as a cathode, and the electrode sheet 27 woundaround the bobbin 22 is used as an anode. When a current is suppliedbetween the cathode and anode from the same electric sources 12 and 13as those illustrated in FIG. 4, the electrode sheet 27 taken out fromthe electrolytic cell 9 becomes a sheet 28 having a high-moleculardielectric layer electrodeposited thereon and then wound up around thebobbin 26. Between the bobbin 26 and the outside guide roll 23a,necessary devices such as a washing device 24, a heat-treating device25, and a polishing device 35 such as a press-heating device may beprovided.

In the above embodiment, if one or both (in the case where bothelectrode sheets are to be subjected to electrodeposition treatment) ofthe electrode sheets of a pair are successively introduced into theelectrolytic cell and then both electrode sheets are pressed to eachother at the portion where the treated sheet or sheets have been takenout from the electrolytic cell and then subjected to solidifyingtreatment, or both electrode sheets are, after being taken out from theelectrolytic cell, subjected to said solidifying treatment while beingpressed to each other, a wound-type capacitor having a large effectivecapacitance and having no airgap can be obtained.

In the case of the embodiments of the invention shown in FIGS. 6 to 9,also, if the particular portions of the electrode sheets are previouslycoated by an insulating coating material capable of being easily removedby a solvent as in the embodiments of FIGS. 1 and 2, and then saidpreviously coated electrode sheets are subjected to theelectrodepositing treatment, particular exposed portions can be formedon the electrode sheets. These exposed portions may be effectivelyutilized to bond on and connect electric parts such as the electrodeconnectors 33, resistors, semiconductor elements and other electriccircuits thereto.

The thickness of the high-molecular dielectric layer according to theinvention can be controlled at will within the range from severalmicrons to several tens of microns by suitable selection of thecomposition of the electrolyte and electrodepositing conditions.Furthermore, desired mechanical and electrical properties of thedielectric layer can be obtained by suitable selection of the kind andcomposition of the electrolyte.

In conventional capacitors in which a high-molecular sheet is insertedbetween electrodes or caused to adhere to the electrode surface, thethickness of said sheet is limited to a relatively large range fromseveral tens of microns to 150 microns, whereby a limitation has beenimposed on the manufacture of capacitors having high efficiency andlarge capacitance because the electrode distance cannot be decreased toa value smaller than a certain limiting, value.

According to the present invention, however, since a highmoleculardielectric layer having uniform and extremely thin thickness can beformed as desired at all portions or particular portions of the surfacesof an electrode or electrodes, it is easily possible to remove anyobstruction due to tracking irregularity, impact, contacting, vibration,etc. Furthermore, the electrodeposited layer of this invention functionsas a protective film against rust and corrosion.

in the variable capacitors as illustrated in FIGS. 1 and 5, allowableerror of the variable capacity is below 1 PF l percent), breakdownvoltage is above 100 volt 100 M0), miniaturization is very easy, andmass production is possible because of simple assembling of the parts.Furthermore, since corona voltage of the capacitors according to thepresent invention is very high, the capacitance characteristic of thesecapacitors is very stable within the range including higher frequencybands. When a certain solid component is electrodeposited on the basicmetal anode as in the case of the present invention, currentconductivity of the coated positions disappears inherently, andpin-holes, cracks, and other defects are not produced in the coatedfilm, so that a strongly and closely deposited film can be formed withina very short time.

There is no limitation in the kind of the electrode metal of thecapacitors according to the present invention and accordingly aluminum,copper, iron and their alloys may be used as said electrode metal, as inthe conventional cases. Of course, when copper is used, it is preferableto plate the copper with an inert metal such as cadmium to remove theobstruction caused by copper ions. Furthermore, according to the presentinvention, capacitors of any type such as variable capacitors of gangedtype or laminated-type capacitors can be simply manufactured withoutchanging the conventional forms, shapes of the parts and constructionmethod.

The present invention is not limited to the above-described embodimentsthereof but may be embodied in other modifications within the scope ofthe subject matter of the invention.

For example, when bubbles are mixed in the high-molecular dielectriclayer, Q (reciprocal of tan Q can be extremely improved, so that if itis required to make 0 high, it is preferable to mix micropowder of aformable material such as formable styrol or mica powder containingbubbles in the dielectric layer. Furthermore, sometimes it is requiredthat the capacitance-temperature coefficient of the capacitorsmanufactured according to the present invention be zero, positive ornegative depending upon the use, such as temperaturecompensation of anelectric circuit. The requirement as described above can be easilyattained by the electrodepositing a resinous dielectric layer comprisinga polyester series material having a positive temperature-coefficientand a styrol series material having a negative temperature-coefficienton the electrode or by electrodepositing different resinous materials,respectively, on different surfaces of the electrode or by laminatingseveral electrodes having, respectively, dif ferent kinds of thedielectric layers electrodeposited thereon. Of course, the requirementas described above can be attained by mixing, in suitable combination, amaterial having a positive capacitance-temperature coefficient such astitanium oxides or steatite ceramics and a material having a negativecapacitance-temperature coefficient such as barium titanate ceramics inthe material forming the high-molecular dielectric layer.

lclaim:

l. A method of manufacturing a capacitor comprising placing at least oneof the opposing electrodes of the capacitor as an anode and a separatelydisposed cathode in an electrolytic cell containing therein anelectrolyte containing as its main ingredient an ionic high-molecularmaterial, passing a unidirectional current through said anode andcathode in said cell thereby to electrodeposit a high-moleculardielectric layer on a desired portion of the surface of said anode,subjecting said dielectric layer to succeeding washing and dryingtreatments, and then assembling the opposing electrodes to manufacture acomplete capacitor in which said high-molecular dielectric layer isdisposed between said electrodes, said anionic high-molecular materialof said electrolyte being a resin material selected from the groupconsisting of a water soluble resin of the melamine series, a watersoluble resin of the stylene series and a water soluble resin of thealkyd series.

2. A method of manufacturing a capacitor as claimed in claim 1, in whichthe current used as the electrodepositing current is prepared bysuperposition of a direct current and a varying current selected fromthe group consisting of an alternating current, pulse current andrectified current.

3. A method of manufacturing a capacitor comprising placing at least oneof the opposing electrodes of the capacitoras an anode and a separatelydisposed cathode in an electrolytic cell containing therein anelectrolyte containing as its main ingredient an anionic high-molecularmaterial, passing a unidirectional current through said anode andcathode in said cell thereby to electrodeposit a high-moleculardielectric layer on a desired portion of the surface of said anode,subjecting said dielectric layer to succeeding washing and dryingtreatments, and then assembling the opposing electrodes to manufacture acomplete capacitor in which said high-molecular dielectric layer isdisposed between said electrodes, said anionic high molecular materialcomprising two resinous materials one having a positive temperaturecoefficient and the other a negative temperature coefficient, saidresinous material having a positive temperature and coefficient beingelectrodeposited on one surface of said electrode and said resinousmaterial having a negative temperature coefficient beingelectrodeposited on another surface of said electrode.

4. A method of manufacturing a capacitor as claimed in claim 3, in whichsaid resinous material having a positive temperature coefficient is apolyester series material and said material having a negativetemperature coefficient is a styrol series material.

5. A method of manufacturing a capacitor, comprising plac ing at leastone of the opposing'electrodes of the capacitor as an anode and aseparately disposed cathode in an electrolytic cell containing thereinan electrolyte containing an anionic high-molecular material andmicropowder of a strong dieleclayer on said anodic sheet; continuouslytaking said electrode tric material, said anionic high-molecularmaterial of said electrolyte being a resin material selected from thegroup consisting of a water soluble resin of the melamine series, awater soluble resin of the stylene series and a water soluble resin ofthe alkyd series, passing a current through said anode and cathode insaid cell thereby to electrodeposit a high'molecular dielectric layer ona desired portion of the surface of said anode, subjecting saiddielectric layer to succeeding washing and drying treatments, and theassembling the opposing electrodes to manufacture a complete capacitorin which said high-molecular dielectric layer is disposed between saidelectrodes.

6. A method of manufacturing a capacitor as claimed in claim 5, in whichthe electrodepositing current is prepared by superposition of a directcurrent and a varying current selected from the group consisting of analternating current, pulse current and rectified current.

7. A method of manufacturing a capacitor as claimed in claim 5, in whichsaid micropowder is selected from the group consisting of titaniumdioxide, barium titanate, formable styrol and mica.

8. A method of manufacturing a wound-type capacitor comprising twoopposing wound electrode sheets, which comprises winding at least one ofsaid electrode sheets on a bobbin; unwinding and introducingcontinuously said wound sheet as an anode into an electrolytic cellhaving a cathode and containing an electrolyte containing as its mainingredient an anionic high-molecular material; said anionichigh-molecular material of said electrolyte being a resin materialselected from the group consisting of a water soluble resin of themelamine series, a water soluble resin of the stylene series and a watersoluble resin of the alkyd series, passing a current through saidelectrode sheet introduced into said cell and said cathode thereby toelectrodeposit a high-molecular dielectric sheet having said dielectriclayer out of said cell; subjecting said sheet to succeeding washing anddrying treatment; and then winding the thus treated sheet around abobbin; and assembling the capacitor by utilizing said treated sheet orsheets as the electrode sheet or sheets of two opposing electrodesheets.

9. A method of manufacturing a capacitor as claimed in claim 8, in whichthe current used as the electrodepositing current is prepared bysuperposition of a direct current and a varying current selected fromthe group consisting of an alternating current, pulse current andrectified current.

10. A method of manufacturing a wound-type capacitor comprising twoopposing wound electrode sheets, which comprises winding at least one ofsaid electrode sheets on a bobbin; unwinding and introducingcontinuously said wound sheet as an anode into an electrolytic cellhaving a cathode and containing an electrolyte containing an anionichigh-molecular material and micropowder of a strong dielectric material;said anionic high-molecular material of said electrolyte being a resinmaterial selected from the group consisting of a water soluble resin ofthe melamine series, a water soluble resin of the stylene series and awater soluble resin of the alkyd series, passing a current through saidelectrode sheet introduced into said cell and said cathode thereby toelectrodeposit a highmolecular dielectric layer on said anodic sheet,continuously taking said electrode sheet having said dielectric layerout of said cell; subjecting said taken-out sheet to succeeding washingand drying treatment; and then winding the thus treated sheet around abobbin; and assembling the capacitor by utilizing said treated sheet orsheets as the electrode sheet or sheets of two opposing electrodesheets.

11. A method of manufacturing a capacitor as claimed in claim 10 inwhich the current used as the electrodepositing current is prepared bysuperposition of a direct current and a varying current selected fromthe group consisting of an alternating current, pulse current andrectified current.

2. A method of manufacturing a capacitor as claimed in claim 1, in whichthe current used as the electrodepositing current is prepared bysuperposition of a direct current and a varying current selected fromthe group consisting of an alternating current, pulse current andrectified current.
 3. A method of manufacturing a capacitor comprisingplacing at least one of the opposing electrodes of the capacitor as ananode and a separately disposed cathode in an electrolytic cellcontaining therein an electrolyte containing as its main ingredient ananionic high-molecular material, passing a unidirectional currentthrough said anode and cathode in said cell thereby to electrodeposit ahigh-molecular dielectric layer on a desired portion of the surface ofsaid anode, subjecting said dielectric layer to succeeding washing anddrying treatments, and then assembling the opposing electrodes tomanufacture a complete capacitor in which said high-molecular dielectriclayer is disposed between said electrodes, said anionic high molecularmaterial comprising two resinous materials one having a positivetemperature coefficient and the other a negative temperaturecoefficient, said resinous material having a positive temperature andcoefficient being electrodeposited on one surface of said electrode andsaid resinous material having a negative temperature coefficient beingelectrodeposited on another surface of said electrode.
 4. A method ofmanufacturing a capacitor as claimed in claim 3, in which said resinousmaterial having a positive temperature coefficient is a polyester seriesmaterial and said material having a negative temperature coefficient isa styrol series material.
 5. A method of manufacturing a capacitor,comprising placing at least one of the opposing electrodes of thecapacitor as an anode and a separately disposed cathode in anelectrolytic cell containing therein an electrolyte containing ananionic high-molecular material and micropowder of a strong dielectricmaterial, said anionic high-molecular material of said electrolyte beinga resin material selected from the group consisting of a waTer solubleresin of the melamine series, a water soluble resin of the styleneseries and a water soluble resin of the alkyd series, passing a currentthrough said anode and cathode in said cell thereby to electrodeposit ahigh-molecular dielectric layer on a desired portion of the surface ofsaid anode, subjecting said dielectric layer to succeeding washing anddrying treatments, and the assembling the opposing electrodes tomanufacture a complete capacitor in which said high-molecular dielectriclayer is disposed between said electrodes.
 6. A method of manufacturinga capacitor as claimed in claim 5, in which the electrodepositingcurrent is prepared by superposition of a direct current and a varyingcurrent selected from the group consisting of an alternating current,pulse current and rectified current.
 7. A method of manufacturing acapacitor as claimed in claim 5, in which said micropowder is selectedfrom the group consisting of titanium dioxide, barium titanate, formablestyrol and mica.
 8. A method of manufacturing a wound-type capacitorcomprising two opposing wound electrode sheets, which comprises windingat least one of said electrode sheets on a bobbin; unwinding andintroducing continuously said wound sheet as an anode into anelectrolytic cell having a cathode and containing an electrolytecontaining as its main ingredient an anionic high-molecular material;said anionic high-molecular material of said electrolyte being a resinmaterial selected from the group consisting of a water soluble resin ofthe melamine series, a water soluble resin of the stylene series and awater soluble resin of the alkyd series, passing a current through saidelectrode sheet introduced into said cell and said cathode thereby toelectrodeposit a high-molecular dielectric layer on said anodic sheet;continuously taking said electrode sheet having said dielectric layerout of said cell; subjecting said sheet to succeeding washing and dryingtreatment; and then winding the thus treated sheet around a bobbin; andassembling the capacitor by utilizing said treated sheet or sheets asthe electrode sheet or sheets of two opposing electrode sheets.
 9. Amethod of manufacturing a capacitor as claimed in claim 8, in which thecurrent used as the electrodepositing current is prepared bysuperposition of a direct current and a varying current selected fromthe group consisting of an alternating current, pulse current andrectified current.
 10. A method of manufacturing a wound-type capacitorcomprising two opposing wound electrode sheets, which comprises windingat least one of said electrode sheets on a bobbin; unwinding andintroducing continuously said wound sheet as an anode into anelectrolytic cell having a cathode and containing an electrolytecontaining an anionic high-molecular material and micropowder of astrong dielectric material; said anionic high-molecular material of saidelectrolyte being a resin material selected from the group consisting ofa water soluble resin of the melamine series, a water soluble resin ofthe stylene series and a water soluble resin of the alkyd series,passing a current through said electrode sheet introduced into said celland said cathode thereby to electrodeposit a high-molecular dielectriclayer on said anodic sheet, continuously taking said electrode sheethaving said dielectric layer out of said cell; subjecting said taken-outsheet to succeeding washing and drying treatment; and then winding thethus treated sheet around a bobbin; and assembling the capacitor byutilizing said treated sheet or sheets as the electrode sheet or sheetsof two opposing electrode sheets.
 11. A method of manufacturing acapacitor as claimed in claim 10 in which the current used as theelectrodepositing current is prepared by superposition of a directcurrent and a varying current selected from the group consisting of analternating current, pulse current and rectified current.